| With the continuous technical development of CNC,materials,and tools,CNC hobbing machine processing performance has been greatly improved.Currently,it only takes as shortest as 8 seconds for the CNC hobbing machine of Gleason Genesis 130 H Series to machine a small diameter planetary gear within 100 mm.The manual or semi-automatic feeding greatly hindered the performance of this type of machine.As the production efficiency is reduced,the machine fails to run at full capacity as planned in the design goal.Additionally,the overlarge labor intensity of the workers restricts the entire production process.Therefore,it is necessary to develop an automatic loading and unloading device for hobbing machine to achieve the best performance and reduce the labor intensity of workers.The purpose of this research is to design a set of electrical control system.With the combination of the design of mechanical components,to achieve the function of automatic loading and unloading for CNC hobbing machine,so that automated production can be realized during the entire production process.Also,to explore multi-point positioning system,multi-function gripper,rapid changeovers and other key technology design.In summary,the main contents of this article are as follows:The overall design of electrical control system of automatic loading and unloading device.After comparing different programs,the electrical control system is confirmed to be mainly controlled by SIEMENS S7-300 Series PLC.The industrial cameras and photoelectric switches will be detection devices.And cylinder and servo work as the electrical control system of the implementation of device.Multi-point positioning system design.By analyzing and comparing the characteristics of different positioning methods,the multi-point positioning function of pallet is determined to be realized with mechanical stop and electrical switch positioning.And the multi-point positioning function of parts delivery achieves with servo positioning.(3)Multi-function gripper design.By analyzing the characteristics of the gripper finger and drive,the servo electric cylinder is determined as a multi-function gripper driver and the gripper finger is designed.(4)Loading and unloading device and gear hobbing machine communication program design.The Profinet bus is confirmed to communicate between devices.And the transfer content is defined.(5)HMI design.Siemens Mobile Panel 277 is confirmed to be the hardware.And the operation interfaces required in menu interface,mode interface,teaching interface and other control system are designed.The loading and unloading device produced according to the upper research is equipped in a transmission factory in Chongqing.The practical application shows that the feeding mechanism meets the requirements of actual use and runs stably and reliably.The average loading and unloading cycle is 14.6 seconds,less than the minimum gear hobbing machine processing cycle of 16.8 seconds.And a worker can take care of three hobbing machines at the same time,which has been obviously improved compared with the past that one can only take care of a hobbing machine.It greatly improves the production efficiency and reduces the worker's labor intensity. |
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